This is killing me...
So the pilot sat in the head of this robot. The head could detach and become a flying machine, I seem to remember it having rotorblades of some sort? Also had a clear domed cockpit? Can't remember much else except watching it when I was about 5yrs old so that would have been 1980.
There was another one around the same time that had all types of vehicles that would resemble the "Cars" movie. They had headlights for eyes and the grill would be there mouth etc... Might have incorporated construction equipment too?

Your description sounds vaguely familiar but I can't think of what it might be right now. Do you recall if it was anime or Western animation?

There is indeed a "Search" feature on these forums. It's located at the top of the page in a menu bar. You might try a search for keywords like "robot" and "head" and "plane" or something and see if you can find anything similar posted here. It's possible this cartoon has been asked about before. Hope you find what you're looking for.

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"There was another one around the same time that had all types of vehicles that would resemble the "Cars" movie. They had headlights for eyes and the grill would be there mouth etc... Might have incorporated construction equipment too?"